Possible adverse impact of contaminants on Atlantic cod population dynamics in coastal ecosystems

Proceedings. Biological Sciences
Kotaro OnoNils Chr Stenseth

Abstract

While many in-laboratory ecotoxicological studies have shown the adverse impact of pollutants to the fitness of an individual, direct evidence from the field on the population dynamics of wildlife animals has been lacking. Here, we provide empirical support for a negative effect of pollution on Atlantic cod (Gadus morhua) population dynamics in coastal waters of Norway by combining unique time series of juvenile cod abundance, body size, environmental concentration of toxic contaminants and a spatially structured population dynamics model. The study shows that mercury concentration might have decreased the reproductive potential of cod in the region despite the general decline in the environmental concentration of mercury, cadmium and hexachlorobenzene since the implementation of national environmental laws. However, some cod populations appeared to be more resistant to mercury pollution than others, and the strength and shape of mercury effect on cod reproductive potential was fjord-specific. Additionally, cod growth rate changed at scales smaller than fjords with a gradient related to the exposure to the open ocean and offshore cod. These spatial differences in life-history traits emphasize the importance of local adaptation ...Continue Reading

References

Aug 13, 2004·Proceedings. Biological Sciences·Halvor KnutsenNils Chr Stenseth
Apr 8, 2006·Proceedings. Biological Sciences·Nils Chr StensethKyrre Lekve
Jun 24, 2006·Science·Heike K LotzeJeremy B C Jackson
Jan 20, 2011·Proceedings of the National Academy of Sciences of the United States of America·Lauren A RogersNils Chr Stenseth
May 3, 2014·Biology Letters·Alvaro BarrosAlberto Velando
Aug 1, 2008·Evolutionary Applications·Esben Moland OlsenNils Chr Stenseth
Jan 17, 2015·Science·Douglas J McCauleyRobert R Warner
Apr 11, 2017·The Journal of Animal Ecology·Lauren A RogersNils C Stenseth
Jun 20, 2017·Molecular Ecology·Julia M I BarthCarl André
Aug 9, 2017·Proceedings of the National Academy of Sciences of the United States of America·Bastiaan StarJames H Barrett
Aug 11, 2017·Biological Reviews of the Cambridge Philosophical Society·Fredric M WindsorCharles R Tyler
Aug 15, 2017·Marine Environmental Research·Jonny BeyerMerete Schøyen
Oct 23, 2018·Evolutionary Applications·Halvor KnutsenEsben M Olsen

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